Might also try an FX5200. It's generic enough it might work with your GeForce... The FX5200 was made in several configurations... for trading, suggest dual DVI, PCI, passively cooled, if you can find one.
Funny, I am having a similiar problem with my 2 dual cards. I have windows vista home premium. I have a nvidia fx5200 and had a nvidia7300t. They worked fine together for a year or so and then yesterday the 7300 blew out so I bought a geoforce 9400gt and then put it in and that worked but not the 5200 card, it says code 43Windows has stopped this device because it has reported problems. (Code 43) and some one or more displays isnt vga compatible. Wierd because they are both nvidia cards, and 2 separate cards worked a day earlier and now they do not work together. I can make the work but only one card at a time. Any thoughts. Myabe the 9400 isnt good?